Re: 06 expedition popping and surging
Same thing is happening to my 2006 Ford Expedition, when I get on the freeway and give it a lot of gas, when my tach hits after 3k I get couple backfire out of the intake, and surges bad. The OBD-II on our SUV provides the fuel rail pressure and that was the 1st thing I checked was I plugged in my Actron CP9185 OBD-II Scan tool, the PSI stays between 38-40PSI when I am driving, and when I hit on the gas where the problem shows up at 3k the fuel pressure shows no sine of problem it still stays with in 38 to 40PSI. It reports misfire on different cyl each time. But would a misfire cause it to backfire through the intake?
I also found that my fuel trim on the left bank is riching up by 20% on the long term fuel trim while under load while the right bank is riching up by 5%, and I also found that the o2 post cat on the right bank is showing same switch rate as the pre-cat as if I have cat problem. I would like to replace all my spark plugs but I need to lern how to remove that fuel rail, shops want to charge $300 - $400 for the spark plug change.